Tentorium

The tentorium is an internal skeleton structure in the head of the insect, the other Hexapoda ( Entognatha ) and millipedes. It arises from finger-like invaginations of the exoskeleton, which are generally called Apodeme. These so-called Tentoriumsäste can remain free in the head inside or unite to form a common structure. The task of the tentorium is the inner stiffening of the hollow head capsule to mechanical stresses, such as those may arise from the work of the mouthparts. In addition, the structure serves as a starting point and an abutment for numerous muscles. Since the tentorium arises from an invagination of the head capsule inwards, his insertion point is outside most visible in the form of a small depression, the Tentoriumsgrube is called. Through the four branches, two front and two rear Tentoriumsgruben result. These are usually within top seams. Your situation is different in different insect orders.

The winged insects ( pterygota ) the tentorium has a characteristic x -shape, which results from the union of the Tentoriumsäste in the head inside. Here either the rear Tentoriumsäste form a broad connection ( called Tentoriumsbrücke ), which are followed by the narrower front branches, or all four branches unite central to a wide plate, the so-called Corpus tentorii. The shape and configuration of the tentorium is characteristic for different insect orders and other affinity groups.

Centipedes in the tentorium forms a movable structure, which is in communication with the Mandibelbasis. At the tentorium -faceted muscles so the movement of the mandibles can cause. This, referred to as " swinging tentorium " structure is one of the most important autapomorphies of millipedes. The homology of the tentorium here referred to as structures with the tentorium of Hexapoda is controversial.

The name of the structure dates back to the form with a central plate and four arms, resembling a stretched tarpaulin of a Roman military tent reminded the describer (see tentorium (tent ) ).

Swell

  • H. Schumann (1970 ): Handbook of Zoology, founded by W. Kükenthal, Edited. of J.-G. Helmcke, D. Starck and H. Wermuth. 4 vol: Arthropoda, 2nd half: Insecta, 2nd Edition, Part 1: General, 9th and 10th article - Berlin ( Walter de Gruyter & Co. ), 1968
  • R. F. Chapman ( 1998): The Insects. Structure and Function. 4th edition. Cambridge University Press ( Cambridge, UK).
  • Miguel Domínguez Camacho (2009): Phylogeny of the Symphyla ( Myriapoda ). Diss, University of Berlin.
  • Gregory D. Edgecombe & Giribet, Gonzalo (2007): Evolutionary Biology of Centipedes ( Myriapoda: Chilopoda ). Annual Review of Entomology 52: 151-170. doi: 10.1146/annurev.ento.52.110405.091326.
  • Markus Koch ( 2003): monophyly of the Myriapoda? Reliability of current arguments. African Invertebrates 44 (1): 137-153.
  • Anatomy (eddy lots)
Autapomorphy Digital Object Identifier
765453
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